This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / arch / x86_64 / kernel / genapic_xen.c

diff --git a/arch/x86_64/kernel/genapic_xen.c b/arch/x86_64/kernel/genapic_xen.c
new file mode 100644 (file)
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--- /dev/null
+++ b/arch/x86_64/kernel/genapic_xen.c
@@ -0,0 +1,162 @@
+/*
+ * Copyright 2004 James Cleverdon, IBM.
+ * Subject to the GNU Public License, v.2
+ *
+ * Xen APIC subarch code.  Maximum 8 CPUs, logical delivery.
+ *
+ * Hacked for x86-64 by James Cleverdon from i386 architecture code by
+ * Martin Bligh, Andi Kleen, James Bottomley, John Stultz, and
+ * James Cleverdon.
+ *
+ * Hacked to pieces for Xen by Chris Wright.
+ */
+#include <linux/config.h>
+#include <linux/threads.h>
+#include <linux/cpumask.h>
+#include <linux/string.h>
+#include <linux/kernel.h>
+#include <linux/ctype.h>
+#include <linux/init.h>
+#ifdef CONFIG_XEN_PRIVILEGED_GUEST
+#include <asm/smp.h>
+#include <asm/ipi.h>
+#else
+#include <asm/apic.h>
+#include <asm/apicdef.h>
+#include <asm/genapic.h>
+#endif
+#include <xen/evtchn.h>
+
+DECLARE_PER_CPU(int, ipi_to_irq[NR_IPIS]);
+
+static inline void __send_IPI_one(unsigned int cpu, int vector)
+{
+       int irq = per_cpu(ipi_to_irq, cpu)[vector];
+       BUG_ON(irq < 0);
+       notify_remote_via_irq(irq);
+}
+
+void xen_send_IPI_shortcut(unsigned int shortcut, int vector, unsigned int dest)
+{
+       int cpu;
+
+       switch (shortcut) {
+       case APIC_DEST_SELF:
+               __send_IPI_one(smp_processor_id(), vector);
+               break;
+       case APIC_DEST_ALLBUT:
+               for (cpu = 0; cpu < NR_CPUS; ++cpu) {
+                       if (cpu == smp_processor_id())
+                               continue;
+                       if (cpu_isset(cpu, cpu_online_map)) {
+                               __send_IPI_one(cpu, vector);
+                       }
+               }
+               break;
+       case APIC_DEST_ALLINC:
+               for (cpu = 0; cpu < NR_CPUS; ++cpu) {
+                       if (cpu_isset(cpu, cpu_online_map)) {
+                               __send_IPI_one(cpu, vector);
+                       }
+               }
+               break;
+       default:
+               printk("XXXXXX __send_IPI_shortcut %08x vector %d\n", shortcut,
+                      vector);
+               break;
+       }
+}
+
+static cpumask_t xen_target_cpus(void)
+{
+       return cpu_online_map;
+}
+
+/*
+ * Set up the logical destination ID.
+ * Do nothing, not called now.
+ */
+static void xen_init_apic_ldr(void)
+{
+       Dprintk("%s\n", __FUNCTION__);
+       return;
+}
+
+static void xen_send_IPI_allbutself(int vector)
+{
+       /*
+        * if there are no other CPUs in the system then
+        * we get an APIC send error if we try to broadcast.
+        * thus we have to avoid sending IPIs in this case.
+        */
+       Dprintk("%s\n", __FUNCTION__);
+       if (num_online_cpus() > 1)
+               xen_send_IPI_shortcut(APIC_DEST_ALLBUT, vector, APIC_DEST_LOGICAL);
+}
+
+static void xen_send_IPI_all(int vector)
+{
+       Dprintk("%s\n", __FUNCTION__);
+       xen_send_IPI_shortcut(APIC_DEST_ALLINC, vector, APIC_DEST_LOGICAL);
+}
+
+static void xen_send_IPI_mask(cpumask_t cpumask, int vector)
+{
+       unsigned long mask = cpus_addr(cpumask)[0];
+       unsigned int cpu;
+       unsigned long flags;
+
+       Dprintk("%s\n", __FUNCTION__);
+       local_irq_save(flags);
+       WARN_ON(mask & ~cpus_addr(cpu_online_map)[0]);
+
+       for (cpu = 0; cpu < NR_CPUS; ++cpu) {
+               if (cpu_isset(cpu, cpumask)) {
+                       __send_IPI_one(cpu, vector);
+               }
+       }
+       local_irq_restore(flags);
+}
+
+#ifdef CONFIG_XEN_PRIVILEGED_GUEST
+static int xen_apic_id_registered(void)
+{
+       /* better be set */
+       Dprintk("%s\n", __FUNCTION__);
+       return physid_isset(smp_processor_id(), phys_cpu_present_map);
+}
+#endif
+
+static unsigned int xen_cpu_mask_to_apicid(cpumask_t cpumask)
+{
+       Dprintk("%s\n", __FUNCTION__);
+       return cpus_addr(cpumask)[0] & APIC_ALL_CPUS;
+}
+
+static unsigned int phys_pkg_id(int index_msb)
+{
+       u32 ebx;
+
+       Dprintk("%s\n", __FUNCTION__);
+       ebx = cpuid_ebx(1);
+       return ((ebx >> 24) & 0xFF) >> index_msb;
+}
+
+struct genapic apic_xen =  {
+       .name = "xen",
+#ifdef CONFIG_XEN_PRIVILEGED_GUEST
+       .int_delivery_mode = dest_LowestPrio,
+#endif
+       .int_dest_mode = (APIC_DEST_LOGICAL != 0),
+       .int_delivery_dest = APIC_DEST_LOGICAL | APIC_DM_LOWEST,
+       .target_cpus = xen_target_cpus,
+#ifdef CONFIG_XEN_PRIVILEGED_GUEST
+       .apic_id_registered = xen_apic_id_registered,
+#endif
+       .init_apic_ldr = xen_init_apic_ldr,
+       .send_IPI_all = xen_send_IPI_all,
+       .send_IPI_allbutself = xen_send_IPI_allbutself,
+       .send_IPI_mask = xen_send_IPI_mask,
+       .cpu_mask_to_apicid = xen_cpu_mask_to_apicid,
+       .phys_pkg_id = phys_pkg_id,
+};